A senior attorney with 40 years of litigation experience, Mike has tried in excess of 200 jury trials to verdict in the state and federal courts of Pennsylvania, as well as other jurisdictions throughout the United States.
Mike is a former member of the firm's Board of Directors, and as a highly experienced litigator and trial attorney, he represents and defends clients in mass torts cases and complex general liability matters.
Mike began his law career in the Philadelphia District Attorney's office where he served as an assistant district attorney for five years. He then joined the civil litigation firm of Krusen, Evans and Byrne in Philadelphia, Pennsylvania. After trying numerous asbestos-related cases, he co founded the firm of Kelley, Jasons, McGuire & Spinelli in Philadelphia where he focused on the preparation and trial of complex personal injury, products liability, and criminal cases.
Honors & Awards
•American College of Trial Lawyers, fellow, 2019
•AV Preeminent by Martindale-Hubbell
•The Best Lawyers in America, Mass Tort Litigation/Class Actions - Defendants (2023-2026)
•The Best Lawyers in America, Criminal Defense: White-Collar (2024-2026)
•The Best Lawyers in America, Commercial Litigation (2026)
•International Academy of Trial Lawyers, 2023
•Pennsylvania Super Lawyers (2019-2026)
Classes/Seminars Taught
•Moderator, In-House Perspective 2021: Managing Relationships & New Technology From the Inside, Perrin Conference, February, 2021
•Panelist, Insights on Diversity in the Legal Community, Perrin Conference, November 2016
•Panelist, Legal Issues Arising in Trial Practice, Lawyers Club Philadelphia, May, 2016
•How to Retain and Prepare Expert Witnesses, Philadelaphia Bar Institute CLE, March 2015
•Moderator, Alternatives to Mock Trial: What You Can Learn With Less Cost, Breakout Session, DRI Asbestos Medicine Seminar, November, 2013
•Panelist, Today's Jury Pool - The Impact of Generation 'Y' and the Social Media Revolution, American Bar Association Litigation Section's Corporate Counsel CLE Seminar, February, 2013
•How To Conduct Effective Opening And Closing Statements, American Bar Association Section of Litigation, National Conference for the Minority Lawyer, 1999
•Seminar, Direct and Cross Examination, Pennsylvania Bar Institute, 1989
Pro Bono Activities
•Director, Univest Bank
•Past President, Germantown Branch Board of Settlement Music School
•Past President, Center City Crime Victim Services Board
News
Marshall Dennehey Announces 2026 Pennsylvania Super Lawyers and Rising Stars Honorees
May 22, 2026
98 Marshall Dennehey Attorneys Recognized in the 2026 Editions of The Best Lawyers in America and the Best Lawyers: Ones to Watch in America
August 20, 2025